Overcharged and network problem

Good day, would you guys kindly contact me ASAP it is urgent 😢 I don't understand why am I being charged R1162, as I can record the only month I am owning is month may which I was supposed to pay on the 25th of May the amount of R569, April month I did pay on the 1st of April, I do have my bank account statement showing the R569 was deducted from you guys on the 1st of April, so the only month I am owning is may and June which should be deducted on the 25th of June, I have been struggling with your network for months now you guys don't want to fix my network problem but you here charging me R1162 that I don't know where you got it